I just ordered an assortment of groz-beckert needles to see what i can make work on my machine. Digging up info on needles for this thing has proven to be a challange. I have been able to sew trough 2 layers of 8-9 oz veg tan with the schementz size 18 leather needles and #69 poly thread. I did noticed that at this thicknes, these needles are barely long enough. On the down stroke, the needle bar is pushing on the foot just a bit. I’m hoping that with the longer grotz-becket 134 needles this wont be a problem. I ordered several of their leather cutting tips including the diamond, s, lr and rr, on sizes 22, 23,24 and 25. I’m going to experiment with threads 138, 207 and 277. This is my first post on the site, but once i get to experimenting, i’ll start a thread.